Nice to know there's something else out there besides Allen Bradley's USB. I did have a customer who had more than 2 dozen dh+ devices and Allen Bradley's USB would not reliably stay online. Thought the one we had was defective, so we tried another and experienced the same issue. An older PCMIA device on that same network worked like a champ. AB's response was that the older PCMIA was built to withstand noise better than the new USB. I'll consider this the next time I have a dh+ network, thanks!